package com.itheima.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.common.CustomException;
import com.itheima.entity.Category;
import com.itheima.entity.Dish;
import com.itheima.entity.Setmeal;
import com.itheima.mapper.CategoryMapper;
import com.itheima.service.CategoryService;
import com.itheima.service.DishService;
import com.itheima.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServicrImpi extends ServiceImpl<CategoryMapper,Category> implements CategoryService {

    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealService setmealService;
    /*
  * 根据id来删除分类。删除之前需要进行判断
  *
  * */

   @Override
    public void remove(Long id){

       LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
       //添加查询条件，根据分类id进行查询
       dishLambdaQueryWrapper.eq(Dish::getCategoryId,id);
       int count=dishService.count(dishLambdaQueryWrapper);
       //查询当前分类是否关联了菜品，如果关联，抛出一个业务异常
       if(count>0){
           //已经关联啦菜品，需要抛出异常
           throw  new CustomException("当前分类下关联了菜品，不能删除");

       }

          //查询当前分类是否关联了套餐，如果关联，抛出一个业务异常
       LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper=new LambdaQueryWrapper<>();
       //添加查询条件，根据分类来进行查询
       setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);
       int count1 = setmealService.count();
       if(count1>0){
           //已经关联啦套餐·抛出异常
           throw  new CustomException("当前分类下关联了套餐，不能删除");
       }

       //正常删除
       super.removeById(id);
   }

}
